Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof withtransitional graphical user interface showing our new design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a fifth image thereof;

FIG. 6 is a sixth image thereof;

FIG. 7 is a seventh image thereof;

FIG. 8 is an eighth image thereof;

FIG. 9 is a ninth image thereof;

FIG. 10 is a tenth image thereof;

FIG. 11 is an eleventh image thereof; and

FIG. 12 is a twelfth image thereof.

FIG. 13 is another front view, in which a mobile phone in broken linesis provided to illustrate an example environment;

FIG. 14 is a second image thereof;

FIG. 15 is a third image thereof;

FIG. 16 is a fourth image thereof;

FIG. 17 is a fifth image thereof;

FIG. 18 is a sixth image thereof;

FIG. 19 is a seventh image thereof;

FIG. 20 is an eighth image thereof;

FIG. 21 is a ninth image thereof;

FIG. 22 is a tenth image thereof;

FIG. 23 is an eleventh image thereof; and,

FIG. 24 is a twelfth image thereof.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-12 and FIGS. 13-24. The process orperiod in which one image transitions to another image forms no part ofthe claimed design.

The outer broken lines in FIGS. 1 to 12 illustrate a display screen orportion thereof, and the outer broken lines showing of the mobile phonein FIGS. 13 to 24 is for environmental purposes only. The remainder ofthe broken lines in the figures depict portions of the graphical userinterface. None of the broken lines form part of the claimed design.

CLAIM We claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, as shown anddescribed.